%0 Journal Article
%A Dörr, Tobias S.
%A Pelz, Alexander
%A Zhang, Peng
%A Kraus, Tobias
%A Winter, Martin
%A Wiemhöfer, Hans-Dieter
%T An Ambient Temperature Electrolyte with Superior Lithium Ion Conductivity based on a Self-Assembled Block Copolymer
%J Chemistry - a European journal
%V 24
%N 32
%@ 0947-6539
%C Weinheim
%I Wiley-VCH
%M FZJ-2021-03365
%P 8061 - 8065
%D 2018
%X In searching for polymer-based electrolytes with improved performance for lithium ion and lithium metal batteries, we studied block copolymer electrolytes with high amounts of bis(trifluoromethane)sulfonimide lithium obtained by macromolecular co-assembly of a poly(isoprene)-block-poly(styrene)-block-poly(ethylene oxide) and the salt from tetrahydrofuran. Particularly, an ultra-short poly(ethylene oxide) block of 2100 g mol−1 was applied, giving rise to 2D continuous lamellar microstructures. The macroscopic stability was ensured with major blocks from poly(isoprene) and poly(styrene), which separated the ionic conductive PEO/salt lamellae. Thermal annealing led to high ionic conductivities of 1.4 mS cm−1 at 20 °C with low activation energy and a superior lithium ion transference number of 0.7, accompanied by an improved mechanical stability (storage modulus of up to 107 Pa). With high Li:O ratios >1, we show a viable concept to achieve fast Li+ transport in block copolymers (BCP), decoupled from slow polymer relaxation.
%F PUB:(DE-HGF)16
%9 Journal Article
%$ pmid:29626360
%U <Go to ISI:>//WOS:000437268400006
%R 10.1002/chem.201801521
%U https://juser.fz-juelich.de/record/894713